Pro-Nazi propaganda, courtesy of the US post office? This unlikely scheme was hatched by George Sylvester Viereck, a German-born American who between 1937 and 1941 sought to marshal US sentiment against intervention in Europe. Those who heeded him included prominent members of Congress, such as Burton Wheeler of Montana and Rush Holt Sr of West Virginia, anti-interventionist Democratic senators known for speeches that prompted accusations of antisemitism. Viereck’s contacts on Capitol Hill allowed him to place anti-interventionist speeches in the appendix to the congressional record. Thanks to friends in high places, he could order inexpensive reprints and have German-American groups...